Represents the amount agreed to be paid for each vessel.

No definition available.

Name:	op_AmountAgreedToBePaidForEachVessel
Namespace Prefix:	op_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Monthly fee, administrative service agreement

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Monthly fee, brokerage service agreement

+ References

No definition available.

+ Details

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Namespace Prefix:	op_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the threshold term for termination of agreement with prior written notice.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of variable fee on hire and on freight.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Paragraph 1B
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-URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 10
-Section 50
-Paragraph 1
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

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Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=op_ManagementFeesToRelatedPartyMember
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=op_VoyageExpensesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=op_IfVesselIsLaidUpAndNotAvailableForEmploymentFor15CalendarDaysMember
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Transactions with related parties - Steamship (Details) - USD ($)		3 Months Ended	6 Months Ended
	Nov. 29, 2021	Jun. 30, 2021	Jun. 30, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Management fees to related parties (Note 3)			$ 411,000
Due to related parties (Note 3)			210,000	$ 59,000
Steamship Shipbroking Enterprises Inc
Related Party Transaction [Line Items]
Monthly fee, brokerage service agreement	$ 95,000
Variable fee on hire and on freight	2.50%
Management fees to related parties (Note 3)		$ 0	774,000
Due to related parties (Note 3)			155,000	$ 33,000
Steamship Shipbroking Enterprises Inc \| Management fees to related parties
Related Party Transaction [Line Items]
Management fees to related parties (Note 3)		$ 0	70,000
Steamship Shipbroking Enterprises Inc \| General and Administrative Expense [Member]
Related Party Transaction [Line Items]
Management fees to related parties (Note 3)			570,000
Steamship Shipbroking Enterprises Inc \| Voyage expenses
Related Party Transaction [Line Items]
Management fees to related parties (Note 3)			$ 204,000
Steamship Shipbroking Enterprises Inc \| Management agreement
Related Party Transaction [Line Items]
Threshold term for termination of agreement with prior written notice	3 months
Steamship Shipbroking Enterprises Inc \| Management agreement \| Monthly fee if vessel is employed or available for employment
Related Party Transaction [Line Items]
Amount agreed to be paid for each vessel	$ 500
Steamship Shipbroking Enterprises Inc \| Management agreement \| Monthly fee if vessel is laid-up and not available for employment for at least 15 calendar days of such month
Related Party Transaction [Line Items]
Amount agreed to be paid for each vessel	$ 250
Steamship Shipbroking Enterprises Inc \| Administrative services agreement
Related Party Transaction [Line Items]
Threshold term for termination of agreement with prior written notice	30 days
Monthly fee, administrative service agreement	$ 10,000